EP0033065B1 - Method and installation for slitting bands - Google Patents

Description

The invention relates to a method for splitting a strip into a plurality of partial strips and then winding it onto a reel, in which the strip, after being cut and before winding, is guided over a length compensation section.

A splitting system used to carry out this process (DE-PS No. 1806305, magazine _" Blech", No. 8 (1970), _" A new cutting process for achieving smooth cut surfaces and burr-free edges") consists of a two-stage separating device (scissors), which cuts the tape with a first tool and cuts the tape into several partial strips with a second tool, also from a reel for the partial strips and a length compensation section upstream of the reel, in particular loop pit, to compensate for different winding speeds of the partial strips.

A prerequisite for a uniform winding of the partial strips on a reel is that the different winding speeds, which result from different winding diameters due to different partial strip thickness on the reel, can be compensated for in a length compensation section, in particular loop pit. Such compensation is of course only possible if the cutting process of the strip into partial strips has been carried out completely.

In a known splitting system (DE-OS No. 2705167), the strip is cut in a counter cut, that is to say in two stages. The first tool in the direction of tape travel cuts the tape, while the second tool in the direction of tape travel cuts the tape. A loop pit is arranged between the two tools and runs through the not yet completely cut band in the sag (FIG. 12). Since the tape has not yet been completely severed at this point, the different winding speeds which only take effect after the severing have been severed cannot be compensated for. Another compensation for the different winding speeds of the partial strips is not provided in this slitting system.

In the known splitting system of the type mentioned (DE-PS No. 1806305, magazine _" Blech", No. 8 (1970) _" A new cutting method to achieve smooth cut surfaces and burr-free edges"), in which the length compensation path in the running direction of the belt behind is arranged in the second tool, it is necessary to grasp the part strips of the strip which come from the second tool and are completely separate from one another and to guide them over the length compensation section to the reel and to connect them there in the correct position. This is done with a clamping device which can be moved from the separating device to the reel by means of a carriage. So that the clamping device can be moved, it is necessary that the plant parts arranged between the separating device and the reel, such as guiding and transport means, straightening devices, brakes, cross-cut shears and the like. Like. Are designed so that they can be moved out of the way of the clamping device and the carriage or allow passage for them. It goes without saying that taking this requirement for a free travel path for the clamping device into account requires considerable design effort.

Another problem, no less significant, is that, for reasons of space, the partial strips cannot be grasped close enough at the exit of the second tool by the clamping device after complete severing, because means for removing the band seams are arranged directly at the exit of the separating device. However, if the cut strips are not detected directly at the exit, they spread out more or less arbitrarily. For this reason, it is difficult to grasp them exactly from the clamping device. One tries to avoid these difficulties by individually feeding the partial strips to the clamping device by hand.

Furthermore, a device for slitting tapes is known, in which a length compensation section for the differently thick partial strips is not provided in accordance with the intended goal (DD-PS No. 128624). In this device, the separating device, which cuts the strip in one step or only cuts it up to an initial section, is arranged indirectly in front of the reel-up. If the tape is cut in one step, measures that are not explained in more detail must be taken in order to at least partially reconnect the partial strips. The partial strips divided in this way, but still or connected again, are wound as a unit onto a reel. The complete cutting can take place up to the first layer (initial section) of the tape on the reel during winding or during later unwinding. With such a method, it is not possible to wind up the partial strips, which have different thicknesses, tightly. Since the separating device is arranged directly in front of the reel, the problems of the separating devices with length compensation sections described above do not arise with such a device.

Finally, a device for slitting very thin strips is known, in which the initial section of the strip is not cut lengthways, but is cut off immediately before connection to the reel up to the area where the strip is split lengthways. The difficulty here is that the waste edge strips of the tape (tape seams) remain attached to the tape until it is cut off or have to be separated from the tape beginning by special intervention, usually by hand. In In both cases, it is then necessary to insert the band hems by hand into the guide means provided for the continuous elimination. With larger bandwidths and hem dimensions, this creates considerable difficulties and risk of injury for the operators. In addition, it is difficult to connect the partial strips to the winding reel in the correct position, since the partial strips can only be gripped after the seams have been separated.

The invention has for its object to provide a method and a system in which the beginning of a tape can be transported from the separating device to the take-up reel and connected in the correct position with less effort. The method and the system should be usable above all for metal strips with a material thickness of over 1 mm to preferably 14 mm.

According to the invention, this object is achieved by the method of the type mentioned at the outset in that the initial section of the strip is only severed after the length compensation section has been overcome immediately before connection to the reel, so that the partial strips are no longer connected to one another.

Since in the invention not like in conventional slitting systems in which the length compensation section is arranged between the separating device and the reel, the beginning of the band, like the rest of the band, is completely severed before passing through the length compensation section, but in contrast to the rest of the band, the beginning of the band only behind the length compensation section and so that it is completely severed immediately before the reel, there are neither the problems associated with the transport of the beginning of the partial strip from the separating device over the length compensation section to the reel nor the problems associated with the correct detection of the partial strip at the exit of the separating device in the invention. In the invention, the beginning of the tape can be transported as easily as an uncleaved tape by conventional means because of the still connected partial strip starts. There are also no space problems for the detection of the partial strips at the exit of the tool before the reel-up, since the band seams are eliminated before the cut-off partial strips are cut and therefore no means for separating the partial strip beginnings arranged between the clamping device and the exit of the separating device prevent it. The partial strip starts can therefore be detected in the correct position directly at the exit of the separating device and inserted in the correct position in the receiving slot of the reel.

Although it is fundamentally possible to cut and cut the beginning of the strip in the direction of the strip running behind the length compensation line, according to one embodiment of the invention, when the strip is split in two stages, in which the strip is cut with a first tool and cut with a second tool, the starting section of the tape cut in front of the length compensation section and completely cut behind the length compensation section. This makes it easier to remove the hems. For this purpose, the hem strips can be separated from the rest of the ribbon and excreted before the first stage of splitting or immediately thereafter.

According to another embodiment of the method according to the invention, there are no difficulties in guiding the tape from the uncoiler to the reel and in separating the hem strips, even with a one-step splitting of the tape, if the beginning section of the tape only cuts through the hems and the seam strips before the length compensation section are excreted and the subsequent strip is then split over the entire width, the starting section being separated only after the compensation section has been overcome.

For the implementation of the method according to the invention in its first alternative (two-stage splitting), a splitting system is suitable which has a two-stage separating device (scissors) for longitudinally dividing the strip into partial strips, which cuts the strip with a first tool and completely cuts it with a second tool severed, further a reel for the partial strips and a length compensation section upstream of the reel, in particular loop pit, to compensate for different winding speeds of the partial strips. This split system is characterized in that the second tool of the separating device can be moved over the length compensation section or that two second tools are provided, one of which is arranged in front of and the other behind the length compensation section.

A splitting system for carrying out the method in the second alternative (single-stage splitting) has a single-stage separating device designed as circular knife shears for dividing the strip lengthwise into partial strips, a reel for the partial strips and a length compensation section upstream of the reel, in particular a loop pit for compensating different winding speeds The partial strip, on, and is characterized in that the circular knife scissors are simultaneously equipped with circular knives with a larger outside diameter for separating the hem strips and with circular knives with a smaller outside diameter for the longitudinal division of the remaining band, and further characterized in that a cross shear for Severing the initial gate is arranged.

According to a further embodiment of the two-stage splitting system, a spreading and clamping device for the partial strips is arranged between the tool of the separating device arranged behind the length compensation section and the reel, at least the clamping part of which can be moved in the direction of the reel is. The clamping and spreading parts can preferably be moved together.

• Fig. 1 eine zweistufig arbeitende Spaltanlage, und
• Fig. 2 eine einstufig arbeitende Spaltanlage.

The invention is explained in more detail below with reference to a drawing showing two exemplary embodiments in a dimetric representation. Show in detail

• Fig. 1 is a two-stage splitting plant, and
• Fig. 2 shows a single-stage splitting plant.

1 has a decoiler 1 with a strip 2 to be unwound and a coiler 3 with a receiving slot 4 for winding up the strip 2, which is divided lengthwise into partial strips 5. Between decoiler 1 and reel 3 are a first tool 6 made of several pairs of circular knives in the tape running direction, on both tape edges a pair of rollers 7 with downstream hem cutters 8 for cut seam strips 14, a second tool 9, consisting of a pair of rollers extending over the entire range, behind one Length compensation section 10, a strip brake 11, a second tool 9 (9) corresponding to the second tool 9, comprising a pair of rollers extending over the entire range, and a clamping and spreading device 12. The spreading and clamping device 12 consists of individual pairs of clamping stones which can be pulled apart transversely to the band direction so that they are at a certain distance from one another. The spreading and clamping device 12 can be moved between the second tool (9) and the reel 3.

Instead of two second tools 9, (9), a single second tool 9 can also be provided. However, this must then be movable between the position on the left in the drawing and the position on the right in the drawing.

• Das Band 2 gelangt mit seinem Anfang in den Wirkungsbereich des Werkzeuges 6, wo die Kreismesserpaare das Band in Längsrichtung mehrfach anschneiden, aber noch nicht durchtrennen. Das Band mit den in der Bandebene verlagerten Teilstreifen gelangt dann mit seinem Saumstreifen 14 in den Wirkungsbereich der Rollenpaare 7, die die Saumstreifen 14 in der Ebene zurückverlagern und dabei die vollständige Durchtrennung der Saumstreifen 14 bewirken. Die Saumstreifen 14 werden nach unten abgelenkt und von Saumzerstücklern 8 in kurze Bandstücke abgetrennt. Das zweite Werkzeug 9 ist zunächst ausser Betrieb gesetzt. Der Bandanfangsabschnitt durchläuft also zusammenhängend die Ausgleichsstrecke 10 und gelangt über die Bremse 11 in den Wirkungsbereich des zweiten Werkzeuges (9). In diesem zweiten Werkzeug (9) werden die Teilstreifen in die Bandebene zurückverlagert, und dadurch wird die vollständige Durchtrennung bewirkt. Unmittelbar am Ausgang des zweiten Werkzeuges (9) werden die Anfänge 5 des durchteilten Bandes 2 von der Klemm- und Spreizeinrichtung 12 erfasst, wobei die Anfänge geringfügig vorne überstehen. Nach Festklemmen der Anfänge der Teilstreifen 5 wird die Klemm- und Spreizeinrichtung 12 in Richtung der Aufhaspel 3 verfahren. Während des Verfahrens werden die Teilstreifen 5 durch Spreizen der kombinierten Klemm- und Spreizeinrichtung 12 auf den gewünschten gegenseitigen Abstand gebracht. Die Anfänge werden dann in den Aufnahmeschlitz 4 eingestossen und der Aufwickelvorgang kann beginnen.

The splitting plant according to the invention works in the following way:

• The band 2 comes with its beginning in the effective range of the tool 6, where the pairs of circular knives cut the band several times in the longitudinal direction, but do not yet cut it. The tape with the partial strips displaced in the tape plane then reaches with its hem strip 14 into the effective range of the roller pairs 7, which shift the hem strips 14 back in the plane and thereby cause the hem strips 14 to be severed completely. The hem strips 14 are deflected downwards and separated into short band pieces by hem cutters 8. The second tool 9 is initially deactivated. The beginning of the strip therefore runs continuously through the compensation section 10 and reaches the area of action of the second tool (9) via the brake 11. In this second tool (9), the partial strips are moved back into the strip plane, and this leads to the complete severing. Immediately at the exit of the second tool (9), the beginnings 5 of the divided band 2 are gripped by the clamping and spreading device 12, the beginnings protruding slightly at the front. After the beginning of the partial strips 5 has been clamped, the clamping and spreading device 12 is moved in the direction of the reel 3. During the process, the partial strips 5 are brought to the desired mutual distance by spreading the combined clamping and spreading device 12. The beginnings are then pushed into the receiving slot 4 and the winding process can begin.

After passing the initial section, the second tool 9 can take effect. The second tool (9) behind the brake 11 must remain effective until the completely severed band 2 has reached the tool (9).

When the partial strips 5 and the effective partial strip braking device 11 are wound up, a different sag will occur in the length compensation section 10 in accordance with the thickness of the partial strips 5 and the winding diameter dependent thereon for the individual partial strips 5. The partial strip braking device 11 ensures that the winding hardness is the same for all partial strips 5.

In an alternative embodiment with only a single second tool 9, after cutting through the beginning section of the strip and grasping the beginning of the partial strip by the clamping and spreading device 12, the tool 9 is moved from the dashed position into the extended position up to the compensation section 10. When moving, the second tool 9 remains effective, however, so that the strip is completely cut through from the beginning without interruption. The partial strip brake device 11 can move with the tool 9 or can be pulled out of the travel path of the tool 9. The embodiment of FIG. 2 differs from the embodiment of FIG. 1 essentially in that the band 2 adjoining the initial section 2a is cut in one step by the pairs of circular knives 6, 6a, whereas the hem strips 14 already start at the front edge of the band are separated and excreted and the remaining tape is gripped by the clamping and spreading device 12 behind the undivided tape start section 2a and pulled in the direction of the reel 3, where the tape start section 2a is cut off with scissors and the protruding spreading partial strips are pushed into the receiving slot 4 . So that the hem strips 14 can be excreted in front of the compensation section 10, the outer pairs of circular knives 6a have a larger outer diameter than the inner pairs of circular knives 6. The different outer diameters of the pairs of circular knives 6a, 6 enable differentiated working positions. While the initial section 2a passes through the pairs of circular knives 6, 6a, only the outer pairs of circular knives 6a are engaged, in such a way that the hem strips 14 are completely separated. When the initial section 2a has passed the pairs of circular knives 6, 6a, the circular knives are moved further together, so that the middle ler circular knife pairs 6 are used and split the band in the middle. It goes without saying that, in the exemplary embodiment in FIG. 1, the outer pairs of circular knives 6 can have a larger outer diameter than the inner pairs of circular knives in order to separate the hem strips 14 in one step. In this case, the pairs of rollers 7 can be omitted.

Claims (10)

1. A method of splitting a sheet (2) into a plurality of strip portions (5) and subsequently winding them on to a winding spool (3), in which after being separated and before being wound up the sheet (2) is fed over a length-adjusting section (10), characterized in that the initial portion of the sheet (2) is separated only after passing through the length-adjusting section (10) immediately before being attached to the winding spool (3), so that the strip portions (5) are no longer joined to one another.

2. A method according to claim 1, characterized in that, in the case of a two-stage splitting of the sheet (2) where the sheet (2) is cut by a first tool (6) and separated by a second tool (9), the initial portion of the sheet (2) is cut in front of the length-adjusting section (10) and completely separated behind the length-adjusting section (10).

3. A method according to claim 2, characterized in that the edge strips (14) are separated from the remaining sheet (2) and removed in the first stage of the splitting or immediately afterwards.

4. A method according to claim 1, characterized in that in the case of a single-stage splitting of the sheet (2) the initial portion of the sheet is only separated at the edges in front of the length-adjusting section (10) and the edge strips (14) are removed and the resulting sheet is then split over its entire width, and the initial portion is separated only after passing through the length-adjusting section (10).

5. A splitting apparatus for sheets (1) with a separating apparatus (cutters) which operates in two stages for dividing the sheet (2) longitudinally into strip portions (5) and which cuts the sheet (2) with a first tool (6) and completely separates it with a second tool (9), and further with a winding spool (3) for the strip portions (5) and a length-adjusting section (10), in particular a loop opening, disposed in front of the winding spool (3) for equalizing different winding speeds of the strip portions (5), according to claim 2, characterized in that the second tool (9) of the separating apparatus may be moved over the length-adjusting section (10), or two second tools [9, (9)] are provided, of which one (9) is disposed in front of and the other [(9)] is arranged behind the length-adjusting section (10).

6. A splitting apparatus according to claim 5, characterized in that a spreading device and a movable gripping device (12) for the strip portions (5) are disposed between the winding spool (3) and the second tool [(9)] disposed behind the length-adjusting section (10).

7. A splitting apparatus according to claim 6, characterized in that the spreading and gripping devices (12) form a structural unit.

8. A splitting apparatus according to anyone of claims 5 to 7, characterized in that a tool (7, 8) for separating the edge strips is provided in front of the length-adjusting section (10) between the first tool (6) and the second tool (9).

9. A splitting apparatus according to any one of claims 5 to 7, characterized in that the first tool (6, 6a) in front of the length-adjusting section (10) consists of pairs of circular knives, the outer pairs (6a) of circular knives of which have a greater external diameter than the inner pairs (6) of circular knives.

10. A splitting apparatus for sheets with a separating apparatus operating in one stage and constructed in the form of circular knife cutters for dividing the sheet longitudinally into strip portions, and further with a winding spool for the strip portions and a length-adjusting section, in particular a loop opening, disposed in front of the winding spool for equalizing different winding speeds of the strip portions, according to claim 4, characterized in that the circular knife cutters are simultaneously provided with circular knives (6a) of greater external diameter for separating the edge strips (14) and with circular knives (6) of smaller diameter for dividing the remaining sheet (2) longitudinally, and in that a transverse cutter (13) for separating the initial portion (2a) of the sheet (2) is arranged directly in front of the winding spool (3).

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